From: Vincent Guittot Date: Mon, 2 Dec 2024 17:46:05 +0000 (+0100) Subject: sched/fair: Do not try to migrate delayed dequeue task X-Git-Tag: v6.14-rc1~184^2~29 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=61b82dfb6b7e1f951fd1e95198a2aee2ccf6a167;p=thirdparty%2Fkernel%2Flinux.git sched/fair: Do not try to migrate delayed dequeue task Migrating a delayed dequeued task doesn't help in balancing the number of runnable tasks in the system. Signed-off-by: Vincent Guittot Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Dietmar Eggemann Link: https://lore.kernel.org/r/20241202174606.4074512-11-vincent.guittot@linaro.org --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 84c0191a8ffab..2aa1d0cb68213 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -9391,11 +9391,15 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env) /* * We do not migrate tasks that are: - * 1) throttled_lb_pair, or - * 2) cannot be migrated to this CPU due to cpus_ptr, or - * 3) running (obviously), or - * 4) are cache-hot on their current CPU. + * 1) delayed dequeued unless we migrate load, or + * 2) throttled_lb_pair, or + * 3) cannot be migrated to this CPU due to cpus_ptr, or + * 4) running (obviously), or + * 5) are cache-hot on their current CPU. */ + if ((p->se.sched_delayed) && (env->migration_type != migrate_load)) + return 0; + if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu)) return 0;